Russia's top national security agency has concluded that a homemade explosive device brought down the passenger plane flying from an Egyptian resort to St. Petersburg last month, killing all 224 people on board. The FSB did not name suspects in what it labeled a terrorist act, according to a report issued by the Kremlin early Tuesday, but President Vladimir Putin vowed to hunt down all those guilty -- implying an intensification of Russia's bombing campaign in Syria could be expected.
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